Engine General Information and Diagnosis: 1A-122
2
Does fuel level meter indicate “E” level (empty)?
Add fuel and recheck.
Go to Step 3.
3
Fuel quality check
1) Check that there is fuel of good quality in the fuel tank.
Is it OK?
Go to Step 4.
Clean in fuel system
circuit and change fuel.
4
Ignition system check
1) Check spark plug and ignition spark of cylinder where
misfire occurs, referring to “Spark Plug Inspection: in
Section 1H” and “Ignition Spark Test: in Section 1H”.
Are they in good condition?
Go to Step 5.
Faulty ignition coil, wire
harness, spark plug or
other system parts.
5
Fuel injector circuit check
1) Using sound scope, check each injector operating sound
at engine cranking or idling.
Do all injectors make operating sound?
Go to Step 6.
Check coupler
connection and wire
harness of injector not
making operating sound
and injector itself. If OK,
substitute a known-
good ECM and recheck.
6
Fuel pressure check
1) Check fuel pressure referring to “Fuel Pressure Check: ”.
Is check result satisfactory?
Go to Step 7.
Repair or replace fuel
system.
7
Fuel injector check
1) Check fuel injector(s) referring to “Fuel Injector
Inspection: in Section 1G”.
Is check result satisfactory?
Go to Step 8.
Replace defective
injector.
8
Ignition timing check
1) Check ignition timing referring to “Ignition Timing
Inspection: in Section 1H”.
Is check result satisfactory?
Go to Step 9.
Check related sensors.
9
EGR system check
1) Check EGR system referring to “EGR System
Inspection: in Section 1B”.
Is check result satisfactory?
Go to Step 10.
Repair or replace EGR
system.
10
Exhaust system check
1) Check exhaust system for exhaust gas clogged.
Is it OK?
Go to Step 11.
Repair clogged of
exhaust system.
11
Engine mechanical system check
1) Check engine mechanical parts or system which can
cause engine rough idle or poor performance.
• Engine compression (Refer to “Compression Check:
For J20 Engine in Section 1D” or “Compression
Check: For M16A Engine with VVT in Section 1D”.)
• Valve lash (Refer to “Valve Lash (Clearance)
Inspection: For J20 Engine in Section 1D” or “Valve
Lash (Clearance) Inspection: For M16A Engine with
VVT in Section 1D”.)
• Valve timing (Refer to “2nd Timing Chain and Chain
Tensioner Removal and Installation: For J20 Engine in
Section 1D” or “Timing Chain and Chain Tensioner
Removal and Installation: For M16A Engine with VVT
in Section 1D”.)
Are they in good condition?
Check wire harness and
connection of ECM
ground, ignition system
and fuel injector for
intermittent open and
short.
Repair or replace
defective part.
Step
Action
Yes
No
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